Either by absorbing them from their surrounding environment or make them in their cytoplasm as part of cell metabolism.

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What do all good exchange surfaces have?

A large surface area to provide more space for molecules to pass through.A fresh supply of molecules on one side to keep the concentration high. Removal of required molecules on one side to keep the conc low.Thin barrier to reduce diffusion distance.

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What are examples of specialised exchange surfaces?

Alveoli in the lungs, small intestine where nutrients are absorbed, liver where levels of sugars in blood are adjusted, root hairs of plants where water and minerals are absorbed, hyphae of fungi, where nutrients are absorbed.